7020 fuel draining back.
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=112678
Printed Date: 14 Sep 2025 at 10:23am
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Topic: 7020 fuel draining back.
Posted By: Jack(Ky)
Subject: 7020 fuel draining back.
Date Posted: 29 Sep 2015 at 9:35pm
If my 7020 sits for several days the fuel drains out of the lines and you have to turn on the key and run the pump and bleed it out. I thought I had it fixed by putting on a new fuel line but after sitting for about a month it did it again. Is it supposed to have a check valve or something to keep it from doing this. Thanks JP
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'59 D14 '68 170 Diesel '81 7020 40 All Crop
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Replies:
Posted By: Auntwayne
Date Posted: 29 Sep 2015 at 10:46pm
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Your fuel lines themselves would not be draining, it would be the end fittings......or....
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Posted By: injpumpEd
Date Posted: 30 Sep 2015 at 7:53am
So it has an electric fuel pump? Is the hand primer still in the system? The hand primer assembly has 2 check valves in it, and they like to catch junk and get held open.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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Posted By: Jack(Ky)
Date Posted: 30 Sep 2015 at 8:25pm
No it is a late model. It has 2 spin on fuel filters and an electric pump. I think the hand primers were phased out by then.JP
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'59 D14 '68 170 Diesel '81 7020 40 All Crop
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Posted By: victoryallis
Date Posted: 30 Sep 2015 at 9:28pm
My 7060 did that change all lines from the tank to the filter problem gone you are leaking air in.
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8030 and 8050MFWD, 7580, 3 6080's, 160, 7060, 175, heirloom D17, Deere 8760
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